Direct reading outside and inside calipers



Nov. 29, 1927.

J. L. AVERY DIRECT READING OUTSIDE AND INSIDE CAL'IPERS Filed Nov. 29, 1922 MvqfOR: JOHN L. EVER; 5y"

Hrromm Patented Nov. 29, 1927.

d l A a a l JOHITL. AVERYJ OFIONG BEACH, CALIFORNIA.

' DIRECTREADINGOUTSEDE ANlTIYN'SIDE CAEIPERS;

ApplicationfiIe'd'NoVemtieriQS, 18552.2 Serial 6033869.

This invention relates to measuring; in: strun'ients and has for its principal ob3ect to pr vido an instrument for taking internaland external measurements between pomts ated in depressioi'is and to rythe moving of thele 's 0t s with consequent destroymg which are sit make unnece a pa in of call of thesettingtwhich has been made, inorder' to remove the calipers from thedepression. This device provides a legs are set, thus enabling the i taking of measurements between depressions w th aocuraey and tac1l1ty. The invention is adapted to the taking ot inside or outside measurements bythe I'GVQl'SlllgOl the caliper leg, will hereinafter bedescribed. i

'lhe advantages of the invention and further objects thereof will be made evident lile llldrliitbl'.

Referring to the draw-ingwhich is tor illustrative purposes only,

1 is a face view of my device as it"is employed for outside calipering.

lis a face view showing the device arranged for inside calipe1*ing.-,

Fig, 3- is an edge View of the-deviceas shown in Fig. 1, this view being taken asindi ated by the arrow v Fig. 1 is a fragmentary view, showing the manner in which it is desirable-to place the scale numerals on calipers employed for cer-- tain classes of work.

As shownin the drawing-I provide a prinnary member-'11 which pro'vides'a primary caliper leg 12and a dial plate 14. The plate 14 may have the generaltorm of a triangularsector, having one arcuate edge; and the en tire member 11 is preterably stamped lrom sheet steel in substantially flat i'orm so that i the dial plate l land the caliperleg' l2will extend in a continuous plane. At a po1nt'15 where the dial plate 14: andthe primary leg 12 join, a secondary member 17 is mounted upona rivet 16, or clamping screw as de- The secondary member 17, show1ias direct reading 'of the distance to which the points ol: the caliper WithreterencetoFig; lit ill be penceived that as the leg 18 is moved relative:-,

to the leg; 2 in a directionindicated'by the arrow the leg 19 Wlll rotatein the direc tron indicatedby'the arrow theposition indicated at 27 which lSiLyClllS-f tance' away. from the zero point of-the scale equal to the distance A. By suitably, graduating the dial plate-14 ibis-possible to read directly;thereupon the cli sta nceithe points of thelegs 12 and 18 are spacedapart; ldor the purpose o't interior andezt-terion;

readings of the. caliper, it is necessary to;

calibrate the ,e raduations from" each end as indicated at 28 and-29, placing these ca-lh brations above and below clivicli11g-lines--80. The are through which the graduations20 extend is preferably divided equallynpon the central axis B-B of the. primar nmemher 11so-thatwhen, t'oi yinsidecalipering the secondarymember 17' isswungithroughsubs itially ahalf revolution and the point 26 o.

the-flinterior reading scale 29.

From comparison of Figs. 1 and-2; it

will be-perceived that for outside Jmeasur mg, the arm 19 moves acrossthe scale from left to rigl'it as indicated by thearrow 23;

while i for inside measurements the leg318 must move upon the scale from right to left as indicated bythe arrow 33 in Fig. 2. Any

Thus when thepoints of the-caliper legs 12 andlS have been spread aparta distanceA, the? point 2t5-ot the leg 19 will have movedinto the arm 19 brought adjacent-tothepoint of the arm 12, the point 25;of the arm 18 will coincide with the zero point of spread of the points'25 and 26 of the arms 12 and 19, such as the distance C, Will be represented upon "the scale 29 in the spacing of the end 25 o'tvthe arm 18 from the zero point of the scale. My deviceemploys buta single dial plate upon which both the in-- terior and exterior graduation are inscribed, and the legs 18 and 19 which adapt the calipers to interior, and exterior measuring move upon this-single plate in indicating-the it caliper readings.

An additional feature of the invention is that the calipers may be easily kept in ac curate reading adjustment. It Will be perceived that owing to the curve of the leg 19 the end 28 thereof approaches the scale graduations 20 at a considerable angle relative to a radial line extending across the point 26. Therefore, as the points 25 of the legs 12 and 18 become Worn from Wear allowing the legs to swing closer together, the face of the end 26 may be ground off to coincide with the zero reading on the scale :28 when the points 25 are together. For certain uses of the calipers, it may be desirable to reverse the scale graduations as indicated in Fig. 1, so that they may be read looking in a direction indicated by the arrow 40. This. however, is merely a matter of design and does not attect the principles of the invention.

From the foregoing description and the accompanying illustration, it will be understood that the primary leg 12 serves in both inside and outside calipering operations. The advantages of the calipers are that as well as being suitable for both inside and outside measurements, the settings of thclegs may be read directly upon the respective scales.

I claim as my invention:

1. Calipers comprising: a. primary member having a leg and a sector shaped dial plate having two arcuate scales thereon; and a secondary member so l'ormed and so pivoted relatively to said primary member that the respective ends of said secondary mem ber constitute legs having a fixed angular relationship and respectively suitable for use in the taking of inside and outside measurements, either of said legs being adapted to cooperate with the leg of said primary member in the taking of a measurement while the other of said legs coacts with its respective cale on the primary member to give a reading of the measurement taken.

2. Calipers comprising a member having a dial and a caliper leg extending in opposite directions from a central pivot point; said dial being provided with two scales reading in opposite directions; a second member pivoted to the first-named member at said pivot point and shaped to provide legs extending in opposite directions from said point, one of said legs serving as an indicator on one of said scales when the other used with the first-named leg as outside calipers and the other of said legs serving as an indicator on the other scale when said other leg is used with the first-named leg as inside calipers.

3. Calipers including: a primary leg; a dial on said primary leg carrying two arcuate scales side by side: a secondary V-shaped caliper member, one leg of said member forming an inside caliper leg and the other leg of said member form ng an outside caliper leg; said cal per member being pivoted atrits vertex to said prin'iary leg, so that said outside caliper leg will point to one of said scales to indicate .inside measures between said inside leg and said primary leg, and so that said inside leg will point to the other of said scales to indicate outside measures between said outside leg and said primary leg.

4-. Calipers ncluding a primary calipei member having a leg and a dial plate carrying two arcuate scales side by side; and a secondary caliper member comprising a pair of caliper legs. said secondary caliper member being pivoted upon said primary mem her so that either leg of said secondary member may be made to cooperate with a corresponding one of said scales to indicate respectively outside and inside measures between the other leg of said membe and the primary leg.

Calipers comprising: a member having a dial and a caliper leg extending in opposite directions i'rom a central pivot point, said dial being provided with two scales reading in opposite directions; a second member pivoted to the first-named member at said pivot point and shaped to provide legs extending in opposite directions from said point, one of said legs serving as an indicator on one of said scales where the other used with the first-named leg as outside calipers and the other of said legs serving as an indicator on the other scale when said other leg is used with the first-named leg as inside calipers.

6. Calipers including: a primary member having a primary leg and a dial carrying two areuate scales side by side; a secondary V-shaped caliper member, one leg of said member iorming an inside caliper leg ano the other leg of said member forming an outside caliper leg: said V-shaped caliper 111cmber being pivoted at its vertex to said primary leg, so that said outside caliper leg will point to one oi" said scales to indicate inside measures between said inside leg and said primary leg, and so that said inside leg will point. to the other of said scales to indicate outside measures between said outside leg and said primary leg.

In testimony wluu'eot'. l have hereunto set my hand at Los Angeles. California, this 15th day of November. 1922.

JOHN L. AVERY. 

